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S E H G U .H S W STEAM-PISTON VALVE.

N0. 260,985. Patented July 11; 1882.

INVENTOR WITNESSES V fijg m'w/ ATTORNEYS.

N. PETERS. MLiMnph-r. wum m. D. C.

UNITED STATES I PATENT. OFFICE.

WILLIAM S. HUGHES, OF LONG ISLAND CITY, NEW YORK.

STEAM PISTON-VALVE.

SPECIFICATION forming part of Letters Patent No. 260,985, dated July 11, 1882. Application filed December 1, 1881. (No model.)

To all whom it may concern Be it known that I, WILLIAM S. HUGHES, of Long Island City, Queens county, New York, have invented a new and Improved Steam- Valve, of which the following is a full, clear, and exact description.

Myinvention consists in a certain construction of a noise-reducing balanced slide-valve working steam-tight in its case, and thereby dispensing with the usual stuffing box and gland, as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of referenceindicate corresponding parts in all the figures.

Figure l is a longitudinalseetion of my improved-valve and case.. Fig. 2 is a cross-section of the valve, and Fig. 3 is a perspective view of one of the packing-rings.

A represents one side of the engine-cylinder, formed with exhaust-port a and steamports b b. I

-B is the valve-case, cored longitudinally.

G is a tube fixed in the case to form a seat for the valve; and D is the valve, formed as a hollow piston, to one end of which the rod 0 is directlyjointed.

The case B is formed with side flanges, by which it is bolted to the cylinder, and is formed with ports'a 1), corresponding to the steam and exhaust ports of the cylinder, such ports being connected by internal grooves on the case, which allow passage of the steam around the tube 0. The case is also formed with ports and grooves 01 near the ends, corresponding to recesses d in the cylinder, which receive the steam from the boiler.

The tube 0 projects at its ends outside of case B to give length for the movement of the valve, and within the case is formed with annular rows of perforations e in line with the ports a b d of the case, to allow the free pasform the admission and cut-off edges, and are of a width to cover the perforations cand give the required lap. The recessed space between the two flanges g is of a width to lap from the exhaust to either steam-port, and thereby establish communication between them.

The valve D has perforationsi near each end, so that steam from either port 01 maypass through the valve to ports a b. When there are two ports at connecting with the boiler the perforations dare not essential; but with only one steam-connection they are required.

By the piston-valve D working steanrtight externally of the steam-chest, stuffing-boxes and glands are-dispensed with and the rod is connected externally to the valye, so that a yoke is not required. There is' also no pressure on the valve-rod, as it is external to the steam-spaces. The valveis perfectly balanced, and the exhaust-steam, being carried through perforations, is regulated so that the noise is reduced on the principle of similar arrangements shown in Letters Patent heretofore issued to me.

To relieve compression when the engine is running without steam, the flanges g are formed with apertures k, that connect the steam and exhaust spaces. At the steam side the apertures 7c are covered by rings Z, which allow escape of compressed air from the cylinder when steam is cut off.

The packing f h are preferably metallic rings split to allow of their expansion, and covered at their split ends with L-shaped strips m, as shown in Fig. 3. These strips m are attached to one end of the packings and lap upon the other end, so that the spaces between the ends are'rendered steam-tight.

Having thus described myinvention, I claim as new and desire to secure byLetters Patent- 1. The combination, with the tube G and the case B, having steam and exhaust passages, of the hollow piston-valve D, having enlarged packed ends, and provided with the intermediate annular flanges, g, forming a space between them and spaces between them and the ends, substantially as and for the purpose set forth.

2. The piston-valve D, formed between its packed ends with steam and exhaust cavities, and the tube 0, formed with perforations ton-valve D, formed with steam and exhaust e, in combination with the case B,formed with cavities and with perforations a", substantially [0 the connected ports a b d, substantially as as described, for operation as set forth. shown and described.

3. The combination of case B, havingsteam- WILLIAM HUGHES ports I) d and exhaust-port a, tube 0, aper- Witnesses: tured to correspond with the steam and ex- GEO. D. WALKER, haust ports of the case, and the hollow pis- U. SEDGWICK. 

